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(N0 Model.)

J. E. ORIGGAL. ELECTRIC INGANDESGENT LAMP.

No. 518,179. Patented Apr. 10, 1394.

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WASNINGTON. D. c.

UNITED STATES ATENT, FFICE.

JOHN E. ORIGGAL, or SPRINGFIELD, MASSACHUSETTS, AsSIeNoR TO THE DAVISELECTRICAL WORKS, or SAME PLAcE.

ELECTRIC ENCANDESCENT LAMP.

SPECIFICATION forming part of Letters Patent No. 518,179, dated April10, 1894.

Application filed December 8, 1 893. $erial No. 493,158- (No model.)

To all whom it may concern.-

Be it known that I, JOHN E. CRIGGAL, a subject of the Queen of GreatBritain, residing at Springfield, in the county of Hampden and State ofMassachusetts, have invented new and useful Improvements in ElectricIncandescent Lamps, of which the following is a specification.

This invention relates to improvements in that class of electricincandescent lamps which have the leading-in Wires in their coursethrough the dome, or mount, within the neck of the lamp bulb, passedthrough a sealing quantity of mercury whereby the entrance of air intothe globe may be excluded.

The object of the invention is to produce a lamp of the class indicated,but of improved construction, whereby the production is facilitated andcheapened.

The improved lamp is illustrated in the accompanying drawings, Figures 1and 2 being central, longitudinal sections-of the improved lamp taken onplanes at right angles, the one to the other. Fig. 3 is a crosssectional View on line 3-3, Fig. 2. Fig. 4 is a sectional andperspective View of the neck, or shank, portion of the bulb, or globe,the same comprising a structural formation which conduces to thecomposition of the present improvement.

In the drawings, A represents the glass globe, or bulb, comprising as aninternal part of its neck the inverted dome, or mount through which theleading-in wires pass, and which is formed in part of glass and in partof other materials, as will shortly appear. The glass part, a, of thisinternal mount for the leading-in wires, consists of two tubes, b, b, ofsubstantially uniform diameter, arranged side by side, they beingpreferably joined by the integral intermediate web, or partition, d, ofglass; and the mouth portions of these tubes diverge, and merge into thesurrounding circular wall of the lamp neck, substantially as shown at f.The leading-in wires, g, g, of any metal desired, are passedlongitudinally through and beyond these tubes, though they are not inany wise supported by the glass constituting them, but they aresupported by the filling material, as plaster of paris, seen at h, audj.The plastic material may be filled in so as to effectually close thelower ends of the tubes; the tubes each receiving thereabove, themercury, 'm, which is of quantity to but partially fill the tubes. Theplastic material, closing the upper ends of the tubes, also serves tosecure the annular cap in place, and to support the terminal stud, orbutton. which is insulated from the cap, said cap and button being inelectrical com munication with theleading-in wires. ThefilamentJc, isjoined in the usualmanner to the inner ends of the leading-in wires.

In lieu of using plaster of paris as the material for closing the innerends of the tubes,

17, b, and for filling the upper mouths thereof, 6 5 I may employ thismaterial in combination with other material, or, I may employ for thispurpose other impervious and compressible materials, or compositionsthereof.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. A lamp bulb, or globe, having supported within its neck two tubes ofglass which are open from end to end, the leading-in wires 7 5 passedlongitudinally through said tubes, a cement or plastic material fillingand closing the inner ends of the tubes, a quantity of mercury in saidtubes above the said inner endfilling, and the filament connected to theinnor ends of the leading-in wires, substantially as described.

2. A lamp bulb, or globe, having supported within its neck two tubes ofglass which are open from end to end, the leading-in wires passedlongitudinally through said tubes, a cement or plastic material fillingand closing the inner ends of the tubes, a quantity of mercury in saidtubes above the said inner endfilling, a cement or plastic materialclosing the upper ends of the said tubes, and the filament connected tothe inner ends of the leading-in wires, substantially as described.

JOHN E. ORIGGAL.

Witn esses:

WM. S. BELLOW'S, J. D. GARFIELD.

